PLC and its architecture

2. 1 referred to as the definition of programmable controller, which is in accordance with the mature and effective relay control concepts and design ideas, using the continuous development of new technology, new electronic devices, gradually formed the various series of products with distinctive features, is a kind of digital computing operations of special electronic computer. It is a logical operations, sequential control, timing, counting and arithmetic operations control procedures, in the form of a series of instructions stored in memory, and then according to the content of the storage, after simulation, digital input and output components, such as the production equipment and production process control of the device. 2. 2 the development of dec 1969, the company according to gm ( General motors) The requirements of the developed world's first application of and get success in gm company. Since the company to commercialize . is designed specifically to compete with relay products and gradually replace the traditional relay. as a kind of special industrial computer, has experienced several development course. 1969-1972 for the first phase, it is the early stages of the in the phase of each manufacturer of hardware and software of controller difference is very big, no unified standard, function is simple, strong specificity, hardware are mainly composed of discrete components, large, poor performance and reliability is not high. 1972 - For the second stage, in this phase the gradually evolved into a kind of special industrial computer, greatly improve the reliability, cost greatly reduced, ladder diagram and the statement list for process language, gradually transition to a standardized system, these have laid the groundwork for the popularity of . 1981 - , iec officially published standards, each manufacturer of to the standardization development. Ladder diagram, statements, the SFC language table have been mature, and high-level programming language interface at the same time, its storage capacity, computing speed and handling of the analog function has been greatly strengthened, now the large and medium-sized has previously DCS 'characteristic' of classical pid algorithm, slope function, such as adaptive algorithm, fuzzy control algorithm. 2. 3 features and functions ( 1) The main characteristic of . 's features are: reliable, fast, flexible modular structure, combination, good compatibility, simple programming and production, rich, strong network functions. ( 2) The main functions of the . system can be a very good complete industrial real-time sequence control, condition control and count control, stepper control; Able to complete d/a, a / d) , (a/a d / a) Conversion, data processing, communication network, real-time monitoring, etc. Years of practice showed that the is durable, reliable, is specially designed for the factory, according to the working environment requires reinforcement element, real-time scanning practice and fault diagnosis function, simple troubleshooting, is deep user preference. is a cause for such a reliable can perform the function of relay logic, sequence diagram, function block, text structure, command directory, or the combination of core or real-time operating system. If a fault occurs, the built-in safety device can maintain mechanical damage, and can maintain orderly, predictable order. 2. 4 the development trend of controller is extremely fast and extremely strong logic control logic operation, sequence control, with unparalleled reliability in discrete control, convenient and easy to learn programming method, which is mainly composed of discrete in the industrial automation is the undisputed leader in the field. Global industrial computer control, open and then open process control system, open process control software, open data communication protocols, huge changes have occurred, almost everywhere, , but may not continue this trend. As the soft ( softplc) The birth of the control configuration software technology and the further perfection and development, installation of softplc configuration software and based on industrial PC control system of the market share is gradually grow, these facts make traditional supplier dramatic changes have taken place in the thoughts, they must face the reality, in the traditional technology development and improvement in a more open stance. For control software, which is the core of the controller, vendors are provided to industrial users open software programming of the configuration tool, but also for industrial users was very positive. In addition, an open communication network technology also obtained the breakthrough, the result is a more open in industrial control industry. ( 6) Process control and management functions. With , DCS and ipc ( Industrial control computer) Competition between gradually strengthened, the manufacturers are peculiar to the traditional DCS will be gradually transplanted to in process control function, make it in the field of process control can compete with DCS, has made great achievements. In order to meet the needs of production and management, the controller manufacturers also increased on the software development management software, through the real-time communication with to collect field data, and through the corresponding software needed to complete production management management functions.
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